Andalusian Institute of Agricultural and Fishering Research and Training IFAPA

Almería, Spain

Andalusian Institute of Agricultural and Fishering Research and Training IFAPA

Almería, Spain
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Sanchez-Gonzalez M.J.,Andalusian Institute of Agricultural and Fishering Research and Training IFAPA | Sanchez-Guerrero M.C.,Andalusian Institute of Agricultural and Fishering Research and Training IFAPA | Medrano E.,Andalusian Institute of Agricultural and Fishering Research and Training IFAPA | Porras M.E.,Andalusian Institute of Agricultural and Fishering Research and Training IFAPA | And 2 more authors.
Scientia Horticulturae | Year: 2015

The present study was conducted to study the effect of pre-harvest factors such as salinity and greenhouse air CO2 enrichment on the quality of a high commercial value, tomato cultivar. The experiment was carried out in two identical, adjacent multispan greenhouses, with polyethylene plastic covering. Hybrid Raf (cv. Delizia), tomato plants, were exposed to two treatments of salinity (5 and 7dSm-1) and two ambient CO2 concentrations (350 and 800μmolmol-1) in which CO2 enrichment was applied during the daytime according to a strategy linked to ventilation. The high salinity treatment (7dSm-1) increased firmness (N), total soluble solids content (SSC), titratable acidity (TA) and the percentage of dry matter of the fruit (% DM), however, the pH was reduced. In return, CO2 enrichment did not affect firmness, TA and pH, whereas SSC and % DM were increased. On the other hand, the climatic variations as temperature, radiation and CO2 concentration, during the period of fruit development (PFD) affected its duration. The effective degree days (EDDs) model that combines temperature and radiation was used to study the relationship with the PFD and quality parameters. A good correlation was found between PFD and EDDs (r2=0.95). Thus the thermal time model by incorporating radiation can be recommended for our region to predict the period of fruit development in a hybrid Raf tomato crop. With respect to quality parameters, an increasing trend was observed between fruit firmness in high salinity conditions and the EDDs though the correlation was weak (r2=0.50). We did not find a relationship on SSC, TA, pH and % DM. CO2 enrichment shortened two days of the PFD and salinity did not affect this parameter. According to the results, CO2 enrichment allows increasing the production of a high value commercial crop grown under saline conditions by reducing the time needed for complete fruit development without compromising organoleptic quality. © 2015 Elsevier B.V.


Sanchez-Gonzalez M.J.,Andalusian Institute of Agricultural and Fishering Research and Training IFAPA | Sanchez-Guerrero M.C.,Andalusian Institute of Agricultural and Fishering Research and Training IFAPA | Medrano E.,Andalusian Institute of Agricultural and Fishering Research and Training IFAPA | Porras M.E.,Andalusian Institute of Agricultural and Fishering Research and Training IFAPA | And 2 more authors.
Spanish Journal of Agricultural Research | Year: 2016

The present study was conducted to determine the mitigating influence of greenhouse CO2 enrichment on the negative effects of salinity in Mediterranean conditions. Hybrid Raf (cv. Delizia) tomato plants were exposed to two salinity levels of the nutrient solution (5 and 7 dS/m) obtained by adding NaCl, and two CO2 concentrations (350 and 800 µmol/mol) in which CO2 enrichment was applied during the daytime according to a strategy linked to ventilation. Increasing water salinity negatively affected the leaf area index (LAI), the specific leaf area (SLA), the water use efficiency (WUE), the radiation use efficiency (RUE) and dry weight (DW) accumulation resulting in lower marketable yield. The high salinity treatment (7 dS/m) increased fruit firmness (N), total soluble solids content (SSC) and titratable acidity (TA), whereas pH was reduced in the three ripening stages: mature green/breaker (G), turning (T), and pink/light red (P). Also, the increase in electrical conductivity of the nutrient solution led to a general change in intensity of the sensory characteristics of tomato fruits. On the other hand, CO2 enrichment did not affect LAI although SLA was reduced. RUE and DW accumulation were increased resulting in higher marketable yield, through positive effects on fruit number and their average weight. WUE was enhanced by CO2 supply mainly through increased growth and yield. Physical-chemical quality parameters such as fruit firmness, TA and pH were not affected by CO2 enrichment whereas SSC was enhanced. Greenhouse CO2 enrichment did mitigate the negative effect of saline conditions on productivity without compromising organoleptic and sensory fruit quality. © 2016 INIA.

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